Symantec Protection Engine automatically uses the most current set of definitions for scanning. However, if a problem is discovered with the current definitions set, you can revert (rollback) to the previous set of antivirus or URL definitions. You can rollback definitions regardless of the method that is used to obtain the definitions. Symantec Protection Engine supports only one rollback of antivirus and URL definitions sets.
Rollback is not supported for any of the Insight specific content.
Symantec Protection Engine installs with the most current definitions that are available at the time the product is released. After you install the product and activate the licenses, you need to perform a definition update to obtain the most current definitions. If you discover a problem with the new definitions, you can revert to the definitions that were shipped with the product.
The LiveUpdate Content page provides information about whether your definition rollback is successful. If the rollback operation fails, it might be because a previous definition set does not exist or because you do not have a valid content license.
To rollback definitions
In the console on the primary navigation bar, click System.
In the sidebar under Views, click LiveUpdate Content.
In the content area under Definition Details, select the definitions set that you want to rollback.
In the sidebar under Tasks, click Rollback <definition feature name> Definitions.